insulator

IPA: ˈɪnsʌɫeɪtɝ

A substance that does not transmit heat (thermal insulator), sound (acoustic insulator) or electricity (electrical insulator).
A non-conductive structure, coating or device that does not transmit sound, heat or electricity (see image)
A person who installs insulation.

Examples of "insulator" in Sentences

This forms an insulator which is not affected by heat or moisture.
Although I am sure it would be hard for her to get brain freeze as air is an awesome insulator!
Glass is a very poor insulator (R-0. 24 per inch), which is why houses with single-pane windows lose so much heat.
The material is also an excellent insulator, and is flexible, making it appropriate in areas at risk of earthquakes.
(In reality, the sheet might do better than the extra glass because it traps air underneath — also a better insulator than glass!)
Durring ice fishing I put a small minnow or smelt about 6-10 inches below the ice and cover the hole with a insulator on the tip up.
Besides serving as a coolant and insulator, mineral oil, a byproduct of petroleum distillation, has many other uses, including as a laxative.
A measure of whether a semiconductor most resembles a conductor or an insulator is given in the band gap - the amount of energy needed to produce moving charge-bearers in the form of electrons and "holes".
And the crowning glory, the "green" sedum roof – actually more of a russet colour – on the Newton building, which acts as a natural insulator, helps prevents flash flooding and provides a haven for birds, bees and butterflies.